Reamer for earth drilling



A 1949- c. w. KANDLE 2,480,372

REAMER. FOR EARTH DRILLING Filed April 27, 1945 By JII/IIIIIIIIIIIIIIlII/fl IN V EN TOR.

4 ttorrieq Patented Aug. 30,1949 2,480,372

" tamer Enron EAR rn'nnip mG I Application April 27, 1945, Serial No,590,622

2 Claims. (Cl. 255-69) 7 l 2 This invention relates to a ream'er forearth hold the flight 6 which is suitably welded thereto. drilling andis particularly applicable to the drill- The head 3 is removably securedto the lower end ing of holes with drills of the type set forth in ofshaft 1. U. S. Patent No. 2,320,612, and the co-pending The flight 6 andshaft 1 may be made up in application, Serial No. 504,343 filedSeptember 30, suitable sections attachable end to end to provide 1943,for Earth drill, now Patent No. 2,401,250, by for the drilling of holesto different depths. the present inventor. The pilot 2 comprises acylindrical casing 8 Portable drills of the auger type with a cuttingheld in place by a bottom end plate 9 and a top head have proven to bevery successful so long end plate I0. Abolt ll extends vertically upwardas the bite is not excessive. When drilling holes 10 through the centerof plates 9 and Ill and threads in excess of twelve to fourteen inchesin diameter into the lower end of shaft 1 in the place norit becomesnecessary to extract the drill from the mally provided for theattachment of a lead screw.

hole frequently to remove the spoil. This, togeth- The top plate Ill andupper end of cylinder 8 have er with the fact that large diameter drillsare a substantially radial slot l2 for receiving the heavy, makes forconsiderable work and loss in blade 5 of the cutting head. time. Thediameter of the head 3 and flight 6 is that The principal object of thepresent invention is normally required for the drilling of a hole l3 toprovide for first drilling the hole with a lighter of the size desired.The diameter of the pilot 2 weight drill of smaller diameter andsubsequently is less than that of the head 3 and is substantiallyreaming the hole with the larger diameter drill. that of the hole M tobe reamed. Usually the head Another object of the invention is toprovide an 3 and its blade 5 overhangs the pilot 2 on about a apparatusfor reaming earth holes. two inch radius, providing for a two inch cutat Another object is to provide an attachment for. the circumference ofthe hole during reaming. an earth drill to center the same in a hole forCuts as large as four and five inches may be emreaming. ployed.

Another object is to prevent falling of spoil into The pilot 2 entershole l4 ahead of the drill l the drilled hole during reaming, and tomore efiecand centers the latter so that the reamed hole 13 tivelyremove the spoil from the hole. will be substantially concentric to theoriginal The invention is illustrated in the accompanyhole The length fpilot 2 Should b Sufficient, ing drawing in which: having regard for itsfit in hole 14, to prevent Figure 1 is a vertical section through a holefalling of spoil into the hole during r min in th ground and theapparatus showing a re m- Shaft 1 is rotated by the motor l5 which isdeing operation partially completed; tachably secured to the upper endthereof.

Fig. 2 is an enlarged side elevation of the pilot The pilot 2 can bereadily assembled and at- -and lower end of the drill with parts brokenaway tached to the drill I in place of the usual lead and sectioned;screw, and when the reaming is complete the Fig. 3 is a transversehorizontal section taken pilot may be removed, releasing the drill fordrillon a line 3-3 between the pilot and the cutter ing operations.

head; and Various embodiments of the invention may be Fig. 4 is avertical section taken across the cutemployed within the scope of theaccompanying ting blade on line 44 of Fig. 2. claims.

The apparatus comprises the usual drill I and I claim: a pilot 2 securedto the bottom beneath the cutting 1. In combination with a drill forearth boring head. having a substantially horizontal head with an Thedrill may comprise a flat horizontal ciropen segment therein having atransverse cutting cular head 3 with an open sector 4 having a cutbladeextending downwardly at a cutting angle at ting blade 5 extendingdownwardly and forwardly the rear edge of said open segment, acylindrical at the rear edge of the sector, and a spiral flight pilotdetachably secured beneath the drill and 6 for lifting spoil as itpasses upwardly and over adapted to fit into a previously drilled holeof the blade. The central vertical shaft I serves to smaller diameterthan the drill to center the drill for reamin operations and preventfalling of spoil into the hole during reaming, said pilot comprising acylindrical casing, a bottom closure plate, a top closure plate disposedto substantially close said open segment in said head, and a centralvertical attaching bolt securing the pilot axially to the drill, andsaid top plate and easing having a slot therein to accommodate thecutting blade of the drill.

2. In combination with a drill for earth boring having a substantiallyhorizontal head with an open segment therein having a transverse cuttingblade extending downwardly at a cutting angle at the rear edge of saidopen segment, a. cylindri cal pilot detachably secured beneath the drilland adapted to fit into a previously drilled hole of smaller diameterthan the drill to center the drill I for reaming operations and preventfalling of spoil into the hole during reaming, said pilot eomprn ing acylindrical casing secured up against the bottom of the drill head, atransverse member REFERENCES CITED The following references are ofrecord in the file of this patent:

UNITED STATES PATENTS Number Name Date 7 152,101 Moinsen 1= 'Juh 16,1874 161,190 Youn Mar. 23, 1875 674,549 Wren May 21, 1901 1,724,005Christensen Aug. 13, 1929 1,822,316 Hartson Sept. 8, 1931 2,009,168Dittmer July 23, 1935 Kandle June 1, 1943

